EP0134670A1 - Méthode de fabrication d'un rotor à aimant permanent - Google Patents

Méthode de fabrication d'un rotor à aimant permanent Download PDF

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Publication number
EP0134670A1
EP0134670A1 EP84304861A EP84304861A EP0134670A1 EP 0134670 A1 EP0134670 A1 EP 0134670A1 EP 84304861 A EP84304861 A EP 84304861A EP 84304861 A EP84304861 A EP 84304861A EP 0134670 A1 EP0134670 A1 EP 0134670A1
Authority
EP
European Patent Office
Prior art keywords
shaft
magnets
magnetisable material
rotor
permanent magnets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84304861A
Other languages
German (de)
English (en)
Other versions
EP0134670B1 (fr
Inventor
George Kasabian
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garrett Corp
Original Assignee
Garrett Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Garrett Corp filed Critical Garrett Corp
Publication of EP0134670A1 publication Critical patent/EP0134670A1/fr
Application granted granted Critical
Publication of EP0134670B1 publication Critical patent/EP0134670B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49009—Dynamoelectric machine
    • Y10T29/49012—Rotor

Definitions

  • Electric generators for use in aerospace applications are high output, high speed devices with critical weight and volume restrictions.
  • Such devices typically have permanent magnet rotors, which have a plurality of rare earth permanent magnet elements located on a shaft of magnetisable material.
  • the shaft has a number of flat machine faces about its periphery, onto which the rare earth permanent magnet elements are mounted.
  • Spacers of aluminium or some other non-magnetisable material are located around the periphery of the shaft in the areas between the magnets, and rings of the same type of non-magnetisable material are located on both ends of the shaft axially adjacent the annulus of permanent magnets and spacers.
  • a further problem encountered in the construction of such a permanent magnet rotor is that the rotor assembly does not have good rigidity or shaft stiffness, which will in turn reduce the flexure critical speed of the device, the maximum speed of rotation without significant dynamic vibration occurring. Since the rotor must be turned at a very high rate of speed, the lack of proper stiffness in the shaft construction will result in a high rejection rate at best, and possibly in a product which will not perform within the required specifications. Finally,the construction of permanent magnet rotor with a shaft, magnets, spacers,and rings,-is an extremely expensive method of manufacture. The very precise tolerance requirements of the spacers and rings and the high unit rejection rate both add further to the high cost of construction of such rotors.
  • the shaft is relatively long and contains a plurality of sets of permanent magnets spaced axially away from each other on the shaft.
  • a shaft having three,sets of magnets would have sequentially located on the shaft a ring, a set of magnets and spacers, a second ring, a second set of magnets and spacers, a third ring, a third set of magnets and spacers, and a fourth ring.
  • Such an assembly does not have sufficient shaft stiffness to allow the shaft to be turned at the equired high speed. Long before the shaft reaches the desired operation speed, the flexure critical speed will be reached and dynamic failure will occur.
  • the spacers and rings surrounding the permanent magnets are eliminated by casting or otherwise forming a non-magnetic material, preferably aluminium, directly onto the steel shaft with apertures for the permanent magnets.
  • the rare earth permanent magnets are then installed into thepockets on the shaft, and the rotor assembly may then be machined. Finally a non-magnetic outer sleeve may be installed on the shaft, preferably by heat-shrinking the sleeve onto the shaft. The rotor may then be balanced.
  • blocks the size of the magnets to be used may be installed on flats machined into the shaft, after which the aluminium casting operation may take place. If however, a substantial number of rotor assemblies are to be manufactured, the assembly may be die cast by constructing a die with retractable blocks which may be inserted into the mould adjacent the flats on the shaft, after which the aluminium may be injected around the shaft. The blocks may then be retracted from the mould, and the workpiece may be removed from the die.
  • the completed assembly will have excellent rigidity characteristics, greatly increasing the flexure critical speed and reducing the possibility of dynamic unbalance in the rotor leading to machine failure. Finally, since fewer parts and operations are required by the technique of the present invention, the cost of manufacturing the rotor is significantly reduced. Even rotor assemblies having multiple rotor sections on a single shaft may be constructed by this technique without substantially difficulty.
  • FIGURE 1 shows a machined shaft 10 of steel or other magnetisable material.
  • the shaft 10 is first turned to a larger outer diameter, a portion of which is shown as indicated at 20.
  • the areas on the shaft axially adjacent to the portion of the shaft onto which the permanent magnets will be located are machined to a smaller diameter, as indicated at 22 and 24.
  • the larger diameter 20 portion of the shaft 10 then has a number of flat faces 30 machined uniformly around the shaft, the number of faces 30 being equal to the number of magnets to be installed around the periphery of the shaft 10. Even at their smallest radius, these faces 30 extend outwardly somewhat from the smaller diameter area 22,24, the smaller diameter areas 22,24 being located below the level of the magnets to avoid flux flow therein.
  • two threaded holes 40 are machined into each face 30. It should be noted that in large scale production utilising die casting techniques, the threaded holes 40 would be unnecessary.
  • blocks 50 which are indentical in size and shape to the permanent magnets to be installed later, are mounted onto the faces 30 of the shaft 10.
  • the blocks 50 may be made out of cold rolled steel.
  • Each block 50 is installed onto a face 30 on the shaft 10 using two screws 52, which are countersunk into the blocks 50. So that the blocks may be easily removed from the shaft 10 after casting, the sides of the blocks 50 may be slightly tapered; for example, the size of the blocks may be one-half degree out of parallel to allow the blocks to be easily removed after the casting operation.
  • the shaft may then have the aluminium casting operation performed thereon.
  • FIGURE 3 shows the shaft 10 with a cast aluminium surface 60 having side areas 62 extending over the surface area of the shaft 10 including the two reduced diameter areas 22,24 (FIGURE 1).
  • the diameter of the cast aluminium 60 should be slightly greater than the outside diameter of the blocks 50 (FIGURE 2) to ensure that roughness in the outer surface of the aluminium casting will not affect the finished product after machining.
  • Aluminium is the preferred material to be cast onto the shaft 10 although other non magnetisable materials could be used.
  • Casting of aluminium does not involve substantial shrinkage of the aluminium as it cools, and so the blocks 50 may be the same size as the magnets.
  • a carbon layer on the shaft 10 before the blocks 50 are installed and the aluminium 60 is cast, aids in ensuring that the aluminium seeps onto all outer surfaces of the shaft 10, including the areas adjacent the intersection between the blocks 50 and the shaft 10.
  • Such a carbon layer may be formed on the shaft 10 by running the flame from an acetylene torch briefly across the surface of the shaft 10.
  • the shaft 10 together with the aluminium casting 60 is then machine turned to take the aluminium layer 60 down to a diameter slightly larger than the desired finished diameter, which slightly larger diameter is the same diameter as the tops of the blocks 50.
  • the side areas 62 of the aluminium casting 60 facing the ends of the shaft 10 are machined flat.
  • the blocks 50 are then removed from the shaft 10 by removing the exposed screws 52 holding them in place.
  • threads of a larger diameter than that of the screws 52 may be machined into the holes in the blocks 50 through which the screws 52 fit freely. While the screws 52 fit freely through the threaded holes in the blocks 50, larger diameter screws (not shown) may be inserted into these threaded holes in the blocks 50 after the screws 52 are removed, and the blocks may be pulled out of the aluminium casting 60.
  • the shaft 10 and aluminium cast material 60 then appear as shown in FIGURE 4.
  • the next step is to install the permanent magnets, which are typically rare earth permanent magnets such as samarium cobalt or al-nickel.
  • the magnets 80 which are usually of a rectangular configuration having flat faces, are installed into the apertures 70 ( Figures 4 and 5), into which the magnets 80 fit exactly.
  • the magnets 80 are so strong that they may be installed into the apertures 70 as shown in FIGURE 5 without the use of any adhesive since the magnets 80 will be strongly attracted to the magnetisable material of the shaft 10.
  • the shaft 10 may then be turned to machine the flat outer surfaces of the magnets 80 which as stated above, are typically flat and must be machined round, as well as to turn the aluminium casting 60 down to the desired finished diameter.
  • the final assembly step is to install the outer shell 90 onto the rotor assembly 100, as shown in FIGURE 6.
  • the outer shell is typically non-magnetic steel such as INCO-718, a material which is both extremely strong and non-magnetic. Another material which may be used for the shell 90 in certain applications is berillium-copper.
  • the shell 90 thickness is kept to a minimum to keep the distance between the magnets 80 and a stator 300 of the device ( Figure 8) as small as possible.
  • the shell 90 thickness may vary from .1 cms to .7 cms. Factors in determining the required shell thickness include the diameter of the rotor assembly 100, the speed at which the device will operate and the related centrifugal force operating on the rotor assembly 100.
  • the shell 90 is an interference fit on the rotor assembly 100.
  • the preferred method for installation is to put the rotor assembly 100 in dry ice, to heat the shell 90 and immediately install the shell. 90 onto the rotor assembly 100.
  • the shell 90 is then immediately cooled by directing water onto the shell 90 and the rotor assembly 100 to reduce the possibility of heat damage to the magnets 80.
  • the rotor assembly 100 and the shell 90 may then be balanced by drilling holes 110 in the side of the aluminium casting portion 60 of the rotor assembly 100.
  • FIGURE 7 shows a rotor assembly 200 containing three separate sets of magnets which may be manufactured according to the present invention.
  • the rotor assembly 200 is covered with a shell 190.
  • Such a rotor assembly containing multiple sets of magnets is virtually impossible to manufacture utilising the spacer and ring technique, but is quite simple to manufacture using the teachings of the present invention.
  • the resulting rotor assembly 200 has sufficient shaft stiffness to ensure that the flexure critical speed is above the desired operating speed.
  • the preferred technique is to die cast the aluminium coating 60 onto the shaft 10.
  • the die (not shown) is constructed so that it has retractable blocks, and when the shaft 10 is mounted in the die, the blocks are moved inwardly adjacent the flat surfaces 30 on the shaft 10.
  • the molten aluminium is then injected into the die, and the retractable blocks are removed from the die, which may then be opened to remove the shaft 10 containing the aluminium coating 60.
  • the device is then machined and finished exactly as described above.
  • a rotor constructed according to the teachings of this disclosure is in a turboalternator, that is, a rotor assembly 250 driven at high speed by a turbine wheel 260, as illustrated in FIGURE 8.
  • the rotor assembly 250 is supported by bearings 270 and 280, and is connected to, and drives,the turbine wheel 260.
  • a nozzle 290 directs hot gas onto the turbine wheel 260.
  • the stator 300 is mounted around the rotor assembly 250.
  • a rotor assembly manufactured according to the above teachings is not very susceptible to excess heat buildup in the magnets, thus effectively eliminating failure of the device due to destruction of the permanent magnets. Since rings and spacers are eliminated by the casting of aluminium directly onto the steel shaft, the requirements of high tolerance machining of components is substantially reduced, along with the high rejection rate of rotors with components not fitting properly. The re-sulting rotor has excellent rigidity, even allowing for multiple sets of magnets on a single shaft. Finally, the manufacturing technique taught herein substantially reduces the cost of manufacturing rotor assemblies, while resulting in rotor assemblies having uniform high quality.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
EP84304861A 1983-07-19 1984-07-17 Méthode de fabrication d'un rotor à aimant permanent Expired EP0134670B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US515331 1983-07-19
US06/515,331 US4549341A (en) 1983-07-19 1983-07-19 Method for producing a permanent magnet rotor

Publications (2)

Publication Number Publication Date
EP0134670A1 true EP0134670A1 (fr) 1985-03-20
EP0134670B1 EP0134670B1 (fr) 1988-06-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP84304861A Expired EP0134670B1 (fr) 1983-07-19 1984-07-17 Méthode de fabrication d'un rotor à aimant permanent

Country Status (5)

Country Link
US (1) US4549341A (fr)
EP (1) EP0134670B1 (fr)
JP (1) JPS6035939A (fr)
CA (1) CA1205506A (fr)
DE (1) DE3471848D1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0187478A1 (fr) * 1984-12-06 1986-07-16 AlliedSignal Inc. Rotor à aimant permanent p. ex. pour générateurs et procédé d'assemblage
GB2172443A (en) * 1985-03-13 1986-09-17 Dowty Fuel Syst Ltd Electrical machines
EP0212552A3 (en) * 1985-08-14 1987-05-13 Kollmorgen Technologies Corporation Composite sleeve for an electric motor and method for producing same
FR2606949A1 (fr) * 1986-11-14 1988-05-20 Ragonot Ind Sa Rotor a aimants permanents pour moteur electrique, et moteur muni d'un tel rotor
WO1998033260A1 (fr) * 1997-01-24 1998-07-30 Commonwealth Scientific And Industrial Research Organisation Electromoteurs tres rapides ameliores
WO1998034324A1 (fr) * 1997-01-29 1998-08-06 Turbocorp Limited Perfectionnements concernant les arbres de rotors grande vitesse
DE19846924A1 (de) * 1998-10-12 2000-04-13 Sachsenwerk Gmbh Permanentmagneterregte Baugruppe einer elektrischen Maschine und Verfahren zu ihrer Herstellung
AU735783B2 (en) * 1997-01-29 2001-07-12 Danfoss A/S Improvements in high speed rotor shafts
AU743860B2 (en) * 1997-01-24 2002-02-07 Danfoss A/S Improvements in high speed electric motors
GB2388479B (en) * 2002-04-26 2007-01-03 Bowman Power Systems Ltd Rotors for electromagnetic machines
US8343572B2 (en) 2007-08-13 2013-01-01 Ashish Varade Composition of electrode material in the form of a coating and a process thereof
EP3422540A1 (fr) * 2017-06-06 2019-01-02 Simeti Group Limited Procédé de collage d'aimants segmentés à l'enveloppe intérieure d'un corps de rotor et équipement permettant de mettre en oeuvre ce procédé
WO2022048831A1 (fr) * 2020-09-04 2022-03-10 Sew-Eurodrive Gmbh & Co. Kg Moteur électrique à rotor

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US4930201A (en) * 1985-08-14 1990-06-05 Kollmorgen Corporation Method for manufacturing a composite sleeve for an electric motor
US4777397A (en) * 1986-08-15 1988-10-11 Marathon Electric Manufacturing Corp. Permanent magnet generator apparatus including a consequent pole rotor
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US5758709A (en) * 1995-12-04 1998-06-02 General Electric Company Method of fabricating a rotor for an electric motor
FR2744854B1 (fr) * 1996-02-08 1998-03-13 Gec Alsthom Moteurs Sa Procede de fabrication d'un rotor magnetoelectrique a griffes, rotor fabrique par un tel procede
FR2746558B1 (fr) * 1996-03-22 1998-04-24 Gec Alsthom Moteurs Sa Rotor magnetoelectrique a griffes, procede de fabrication d'un tel rotor
JP2992265B2 (ja) * 1997-04-29 1999-12-20 エルジー電子株式会社 圧縮機用モータのマグネット配設構造
KR19990048726A (ko) * 1997-12-10 1999-07-05 구자홍 리니어 모터의 마그네트 고정구조
US6481090B1 (en) * 2001-06-25 2002-11-19 Electric Boat Corporation Installation and removal of energized permanent magnets in permanent magnet rotors
JP2005328601A (ja) * 2004-05-13 2005-11-24 Minebea Co Ltd 電動シャッター又は電動ブラインド用チューブモータ
DE602005018605D1 (de) * 2005-04-22 2010-02-11 Infranor Holding S A System zur Befestigung von Dauermagneten
US7183683B2 (en) * 2005-06-23 2007-02-27 Peopleflo Manufacturing Inc. Inner magnet of a magnetic coupling
US7549205B2 (en) * 2005-06-24 2009-06-23 Peopleflo Manufacturing Inc. Assembly and method for pre-stressing a magnetic coupling canister
US20070138891A1 (en) * 2005-12-19 2007-06-21 Emerson Electric Co. Magnet retention and positioning sleeve for surface mounted rotor assemblies
US7673380B2 (en) 2007-04-23 2010-03-09 Varco I/P, Inc. Methods for making rotors for permanent magnet motors
BE1018010A3 (nl) 2008-06-13 2010-03-02 Atlas Copco Airpower Nv Werkwijze voor het met een klempassing monteren van een bus rond een gedeelte van een as.
CN102946173B (zh) * 2012-09-25 2015-01-07 宁波菲仕运动控制技术有限公司 一种磁瓦外套热压工装
US20140140857A1 (en) * 2012-11-20 2014-05-22 Turbogen, Llc Rotor assembly and method of using same
US20150022041A1 (en) * 2013-07-18 2015-01-22 Honeywell International Inc. Method of cooling a generator or motor rotor with end disks and a hybrid shaft assembly
US10267315B2 (en) * 2013-11-28 2019-04-23 Acd, Llc Cryogenic submerged pump for LNG, light hydrocarbon and other electrically non-conducting and non-corrosive fluids
CN106233581A (zh) * 2014-02-03 2016-12-14 坎里格钻探技术有限公司 电动机中永磁体的联接
US20150333584A1 (en) * 2014-05-15 2015-11-19 Calnetix Technologies, Llc High speed brushless dc electric machine
US10742082B2 (en) * 2014-12-31 2020-08-11 Ingersoll-Rand Industrial U.S., Inc. Fixation system for a permanent magnet rotor
US11364757B2 (en) 2019-06-28 2022-06-21 Ree Automotive Ltd Device and method for double-arm suspension and in-wheel steering
US11480032B2 (en) * 2020-03-02 2022-10-25 Weatherford Technology Holdings, Llc Debris collection tool
EP4037158B1 (fr) 2021-02-02 2025-07-30 Black & Decker, Inc. Moteur sans balai comprenant un pont de palier imbriqué

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FR2457031A1 (fr) * 1979-05-15 1980-12-12 Lucas Industries Ltd Procede d'assemblage d'un rotor a aimants permanents
DE8031234U1 (de) * 1980-11-24 1981-04-02 Siemens AG, 1000 Berlin und 8000 München Dauermagneterregter laeufer fuer eine elektrische maschine
FR2503950A1 (fr) * 1981-04-10 1982-10-15 Goig Florencio Perfectionnements apportes aux rotors notamment pour l'excitation d'alternateurs destines a l'allumage de moteurs pour vehicules a deux roues ou plus de deux roues
GB2117188A (en) * 1982-03-24 1983-10-05 Okuma Machinery Works Ltd A permanent magnet rotor for synchronous motors

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FR2457031A1 (fr) * 1979-05-15 1980-12-12 Lucas Industries Ltd Procede d'assemblage d'un rotor a aimants permanents
DE8031234U1 (de) * 1980-11-24 1981-04-02 Siemens AG, 1000 Berlin und 8000 München Dauermagneterregter laeufer fuer eine elektrische maschine
FR2503950A1 (fr) * 1981-04-10 1982-10-15 Goig Florencio Perfectionnements apportes aux rotors notamment pour l'excitation d'alternateurs destines a l'allumage de moteurs pour vehicules a deux roues ou plus de deux roues
GB2117188A (en) * 1982-03-24 1983-10-05 Okuma Machinery Works Ltd A permanent magnet rotor for synchronous motors

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PATENT ABSTRACTS OF JAPAN, vol. 5, no. 125, 12 August 1981, & JP-A-56-62054 (HITACHI SEISAKUSHO K.K.) 27-05-1981 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0187478A1 (fr) * 1984-12-06 1986-07-16 AlliedSignal Inc. Rotor à aimant permanent p. ex. pour générateurs et procédé d'assemblage
GB2172443A (en) * 1985-03-13 1986-09-17 Dowty Fuel Syst Ltd Electrical machines
EP0212552A3 (en) * 1985-08-14 1987-05-13 Kollmorgen Technologies Corporation Composite sleeve for an electric motor and method for producing same
FR2606949A1 (fr) * 1986-11-14 1988-05-20 Ragonot Ind Sa Rotor a aimants permanents pour moteur electrique, et moteur muni d'un tel rotor
AU743860B2 (en) * 1997-01-24 2002-02-07 Danfoss A/S Improvements in high speed electric motors
US6194852B1 (en) 1997-01-24 2001-02-27 Commonwealth Scientific And Industrial Research Organisation High speed electric motors
WO1998033260A1 (fr) * 1997-01-24 1998-07-30 Commonwealth Scientific And Industrial Research Organisation Electromoteurs tres rapides ameliores
WO1998034324A1 (fr) * 1997-01-29 1998-08-06 Turbocorp Limited Perfectionnements concernant les arbres de rotors grande vitesse
AU735783B2 (en) * 1997-01-29 2001-07-12 Danfoss A/S Improvements in high speed rotor shafts
DE19846924A1 (de) * 1998-10-12 2000-04-13 Sachsenwerk Gmbh Permanentmagneterregte Baugruppe einer elektrischen Maschine und Verfahren zu ihrer Herstellung
GB2388479B (en) * 2002-04-26 2007-01-03 Bowman Power Systems Ltd Rotors for electromagnetic machines
US8343572B2 (en) 2007-08-13 2013-01-01 Ashish Varade Composition of electrode material in the form of a coating and a process thereof
EP3422540A1 (fr) * 2017-06-06 2019-01-02 Simeti Group Limited Procédé de collage d'aimants segmentés à l'enveloppe intérieure d'un corps de rotor et équipement permettant de mettre en oeuvre ce procédé
WO2022048831A1 (fr) * 2020-09-04 2022-03-10 Sew-Eurodrive Gmbh & Co. Kg Moteur électrique à rotor

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JPS6035939A (ja) 1985-02-23
DE3471848D1 (en) 1988-07-07
US4549341A (en) 1985-10-29
EP0134670B1 (fr) 1988-06-01
CA1205506A (fr) 1986-06-03

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